Change-gear device.



H. F. SCHMIDT. CHANGE GEAR DEVICE. APPLlCATIOH FILED JUNE 19. I916.

1,81,655, Patented July 3, 1917.

2 SHEETS-SHEET I.

wig/J5.

H. F. SCHMIDT.

CHANGE GEAR DEVICE. APPLICATION FILE D JUNE I9, 1916.

Lfi31 655 Patented July 3, 1917.

2 $HEETS-SIIEET 2- 27a awzzfaz I .ii zzyo Zia/2mm a sine Parana nation.

HUGO F. SCHMIDT, OF CHICAGO, ILLINUIS.

onanenenan nnvrcn.

To all whom it may concern Be it known that I, HUGO F. SCHMIDT, a citizen of the United States, residing in Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Change-Gear Devices, of which the following is a specification.

This invention relates to improvements in change-gear devices and more especially to that form of change-gear device comprising spur gears on parallel shafts, which are adapted by a sliding movement of some of them to be meshed and unmeshed according to the particular combination desired. Such a change-gear device is used quite generally in connection with an internal combustion engine in motor vehicles and is commonly called a sliding-gear transmission,

or a sliding gear-set. The invention is here shown as embodied in a change-gear device of such form and is illustrated in the accompanying drawings in which:

Figure 1 is a View of the complete changeg'ear device shown in vertical longitudinal section through its center.

Fig. 2 is a transverse vertical section on the line 2-2 of Fig. 1.

Fig. 3 is a horizontal section on the line 3-3 of Fig. 2.

As shown in said drawings the changegear device comprises a suitably shaped housing 1, in which are arranged two parallel shafts, 2 and 3, the latter being journaled at their ends in the walls of the housing and being respectively as here shown, a drlving shaft and a driven shaft. The driving shaft 2 is shown journaled at its ends on small rollers 10, which are arranged in bear-. ing rings or race-ways 11; and the latter are fitted into semi-cylindric recesses 1212 in the lower edges of two opposite walls of the housing 1, and are secured in place by inverted bearing caps 15, 15. These bearing caps 15 are made integral with a shallow bowl-shaped member 16, forming an oil or grease pan to confine the lubricant within? the housing 1.

The driven shaft 3 is similarly journaled at its ends on rollers 20, which are likewise arranged in bearing rings or race-ways; and the latter are fitted into cylindric openings in the end walls of the housing 1.

On the shaft 2 are arranged four spur gears of different diameters, these gears being fixed non-rotatively to theshaft. On the shaft 3 are arranged corresponding gears Specification of Letters Patent.

Patented July 3, 1913.

Application filed. June 19, 1916. Serial No. 104,536.

adapted to mesh with the gears on the shaft 2, but the shaft 3 is made. with four long splines 25 and the hubs of the gears on gear 27 on the shaft 2 to form the lowest gear combination or first speed, as it is commonly termed, and the two gears 30 and 31 are adapted to slide together either into a POSIlJlOII where the larger gear 30 meshes with agear 33 on the driving shaft, or into a second position where the smaller of the two, 31, meshes with a gear 35 on the driving shaft, forming respectively the intermediate and the highest gear combination or the second and third speeds, respectively.' Inaddition the gear 26 is arranged to be driven by a gear 40 on the shaft 2 through an intermediate pinion 41 to form a reverse-gear combination when the gear 26 is slid into mesh with such pinion 41.

The gear 26 and the two gears 30 and 31 are shifted on the shaft 3 by shifting forks and 51 respectively, which engage in grooves in the hubs of the gears, and these shifting forks are constructed as follows: Above the shaft 3 and parallel thereto is arranged a shaft 55 which is fitted at its ends into the walls of the housing 1, being fixed in position by a pin 56. The shifting fork 50 is made integral with a vertical shank 58, the upper end of which is extended to form a horizontal arm 59 in parallel relation to the shaft 55; the complete lfork being shaped somewhat like an inverted letter L. At each end of the horizontal arm 59 are formed transverse flanges orprojections 60 and 61 through which are openings to receive the shaft 55, so that the panttmay slide endwise .upon the shaft. Similarly the fork 51 is made with a vertical shank- 62 having at its upper end a horizontal arm 63, and at the ends of this arm are transverse flanges 64 and 65 respectively, with openings through them to receive the shaft 55, so

7 near its lower end in such manner that it may be moved forward, backward and sidewise, being made with a large ball 71 journaled in a spherical opening in a socket-piece 72. This latter part is fitted into the neck of a bell-shaped cover 73 bolted upon the top of the ear housing. The lever 70 is prevented rom twisting by a pin 91 which engages in radial grooves in the part 72; and the parts are held in place by a locking ring, 92, which is sprung into a circumferential groove in the neck ofthe part 73 above the socket-piece 72 to prevent the ball 71 from moving upward.

The two horizontal arms 59 and 63 of the shifting forks project above the plane of the shaft in the form of two parallel ridges 95, with fiat faces on their ad3acent and opposite surfaces, and the shorter arm 7 4 of the gear shift lever extends downward below the ball joint into a position between these ridgeswhere it is formed with two oppositely extending short thick pins 76. The pins 76 are adapted to enga e in deep notches 77 in the ridges 95 when t e lever is shifted to one side or the other, so that by the sidewise movements of the lever one of the shifting forks may be engaged and the other one released, or vice versa. Above, and to each side of the shaft 55 are also arranged latches designed to enga e in the same notches 77 and prevent the shifting forkszfrom moving except when actuated by the shifting arm 7 4, each of these latches comprising a small latch bolt 80 which slides in a cylindric opening in a part 81 made integral with the bellshaped cover 73. pressed toward each other by springs 83 bearing against threaded plugs 84, and they are pointed at their inner ends and adapted to engage in the notches 77 from the sides of the ridges 95 opposite to the pins 7 6, so that when the two shifting forks are in their neutral position, with the gears out of mesh, the arm 74 will occupy a vertical position with the two shifting parts 59 and 63 latched by the latch-bolts 80 engaging in the notches; and the ends of these latch-bolts .will likewise press against the ends of thecompletion of such forward and backward These latch bolts are :the other.

movement of either shifting fork the latter is held I yieldingly in position for a correct meshing of the. gears by the corresponding latch-bolt 80 entering a small depression 87 made in the outer face of the ridge 95 in line horizontally with the notch 77, while the pin 76 is kept in engagement with its notch by the narrowness of the space between the two ridges 95 which will prevent the arm 74 from moving sidewise except when the two notches 77 are opposite each other and the gears in device, the combination with a shaft having ears adapted to slide thereon, of another s aft having two parts arranged to slide endwise thereon and adapted to engage such gears to impart endwise movement thereto, openings in such sliding parts, a shifting lever havin 'its lower end arranged between the two sllding parts and having its lower part adapted to engage in either opening to impart movement to one sliding part while permitting the other to remain stationary, and locking bolts adapted to engage in the same openin in the sliding parts and adapted to pushed out of engagement with the respective sliding parts by the engagement of the lower end of the shifting lever therein.

3. In a chan e-gear device the combination with a sha t and gears sliding thereon, of another shaft, two slidin members on such shaft in overlapping re ation to each other, and a shifting lever arranged between such two sliding parts and adapted to engage with either one and to release the other one. 4. In a change-gear device the combination with a shaft and two sliding members thereon, of two shifting forks adapted to engage such slidin members, a single shaft supporting such s iftin forks and means for actuating either for 5. In a change-gear device the combination with a shaft having sliding members thereon, of another shaft with two shifting forks slidingly mounted thereon and adapted to engage such sliding members, and

means for engaging either fork to impart movement thereto independently of the other. 1

6. In a change-gear device the combination with a shaft having gears adapted to slide thereon, of another shaft having two parts arranged to slide endwise thereon and adapted to engage such gears to impart end- 5 wise movement thereto, openings in such sliding parts, and a shifting lever adapted to engage in either opening to impart movement to one sliding part while permitting the other to remain stationary.

In Witness whereof I have hereunto sub- 10 scribed my name this 16th day of June, 191.6.

HUGO F. SCHMIDT. 

